This boss fight is hard, as they are both twice your size. Rember to use block/guard, Avoid Starscream when he's flying but shoot at Blackout while he'f flying. When they are on the grond block untill they pause and then attack, but in the case of Blackout, When he block run, because his next attack with take half your health away. When fighting the both, shoot at starsceam and keep him as far away as possible and button smash away at balckout remebering to run if he guards. Kill Balckout first and then finish off Starsceam last.